Airline Pilots Raise Training Concerns About Boeing's 737 Max

But, according to the pilots union for American Airlines, the system upgrade wasn't included in Boeing's standard operating manual.

Boeing and the FAA are in discussions regarding the need for design or software changes in the jet.

Earlier on Wednesday, a top Lion Air official alleged that the company failed to warn pilots about the potential risks of the new safety feature connected to the crash.

They warned pilots that computers on the 737 Max could force the plane to dive, making it hard for pilots to control.

Pilots on a flight from Jakarta to Bali the day before the crash experienced a similar sensor issue but managed to land safely by turning off the system, the New York Timesreported.

The aircraft was a virtually brand-new Boeing 737 MAX 8 that was designed and manufactured in the United States. "That's why we don't have the special training for that specific situation", Zwingli said.

Investigators believe an erroneous sensor prompted a computerized safety system to aggressively push the jet into a dive as pilots were trying to deal with multiple malfunctions. American Airlines vowed to keep pilots abreast of all updates pertaining to the matter.

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The jet operated by budget carrier Lion Air crashed into the Java Sea shortly after take-off from Jakarta, killing all 189 people on board.

Southwest Airlines, the biggest operator of the 737 MAX 8, replaced two malfunctioning flight-control sensors of the same type during the three weeks before the Lion Air craft, Wall Street Journal said, citing a summary of the US carrier's maintenance record it reviewed. "Tragically, Dr. Putrama, a young medical doctor, was flying back home from a conference to get married this week".

We are deeply saddened by the loss of Lion Air Flight JT 610.

Boeing said last week that a safety bulletin issued to aircraft operators in the wake of the crash was merely meant to reinforce existing procedures.

Pilots can stop the automated response by pressing two buttons if the system behaves unexpectedly, the FAA says.

SCHAPER: Boeing does not acknowledge any such omission of critical safety information from its 737 MAX training manuals.

"They (Boeing) didn't provide us all the info we rely on when we fly an aircraft", Capt. Dennis Tajer, a spokesman for the APA group, told CNN on Tuesday.